7/1-5/x

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Solution for 7/1-5/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

7/1-(5/x) = 0

7-5*x^-1 = 0

-5*x^-1 = -7 // : -5

x^-1 = 7/5

-1 < 0

1/(x^1) = 7/5 // * x^1

1 = 7/5*x^1 // : 7/5

5/7 = x^1

x = 5/7

x = 5/7

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